linux-kernel - Re: [PATCH] fchmodat2: add support for AT_EMPTY

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Message-Id: <20230728-ecken-umliegenden-76b55cb82ea5@brauner>
Date:   Fri, 28 Jul 2023 16:49:25 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Aleksa Sarai <cyphar@...har.com>
Cc:     Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Alexey Gladkov <legion@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] fchmodat2: add support for AT_EMPTY_PATH

On Fri, 28 Jul 2023 21:58:26 +1000, Aleksa Sarai wrote:
> This allows userspace to avoid going through /proc/self/fd when dealing
> with all types of file descriptors for chmod(), and makes fchmodat2() a
> proper superset of all other chmod syscalls.
> 
> The primary difference between fchmodat2(AT_EMPTY_PATH) and fchmod() is
> that fchmod() doesn't operate on O_PATH file descriptors by design. To
> quote open(2):
> 
> [...]

A follow-up patch with selftests would be appreciated.

---

Applied to the vfs.fchmodat2 branch of the vfs/vfs.git tree.
Patches in the vfs.fchmodat2 branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fchmodat2

[1/1] fchmodat2: add support for AT_EMPTY_PATH
      https://git.kernel.org/vfs/vfs/c/5daeb41a6fc9